#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>
#include <errno.h>

int set_opt(int fd,int nSpeed, int nBits, char nEvent, int nStop)
{
    struct termios newtio,oldtio;
    if ( tcgetattr( fd,&oldtio) != 0) 
    {
        perror("SetupSerial 1");
        return -1;
    }
    bzero( &newtio, sizeof( newtio ) );
    newtio.c_cflag |= CLOCAL | CREAD;
    newtio.c_cflag &= ~CSIZE;
    switch( nBits )
    {
        case 7:
            newtio.c_cflag |= CS7;
            break;
        case 8:
            newtio.c_cflag |= CS8;
            break;
    }

    switch( nEvent )
    {
        case 'O':
            newtio.c_cflag |= PARENB;
            newtio.c_cflag |= PARODD;
            newtio.c_iflag |= (INPCK | ISTRIP);
            break;
        case 'E': 
            newtio.c_iflag |= (INPCK | ISTRIP);
            newtio.c_cflag |= PARENB;
            newtio.c_cflag &= ~PARODD;
            break;
        case 'N':  
            newtio.c_cflag &= ~PARENB;
            break;
    }

    switch( nSpeed )
    {
        case 2400:
            cfsetispeed(&newtio, B2400);
            cfsetospeed(&newtio, B2400);
            break;
        case 4800:
            cfsetispeed(&newtio, B4800);
            cfsetospeed(&newtio, B4800);
            break;
        case 9600:
            cfsetispeed(&newtio, B9600);
            cfsetospeed(&newtio, B9600);
            break;
        case 115200:
            cfsetispeed(&newtio, B115200);
            cfsetospeed(&newtio, B115200);
            break;
        case 460800:
            cfsetispeed(&newtio, B460800);
            cfsetospeed(&newtio, B460800);
            break;
        default:
            cfsetispeed(&newtio, B9600);
            cfsetospeed(&newtio, B9600);
            break;
    }
    if( nStop == 1 )
        newtio.c_cflag &=  ~CSTOPB;
    else if ( nStop == 2 )
        newtio.c_cflag |=  CSTOPB;  
    newtio.c_cc[VTIME]  = 0;
    newtio.c_cc[VMIN] = 0;
    tcflush(fd,TCIFLUSH);
    if((tcsetattr(fd,TCSANOW,&newtio))!=0)
    {
        perror("com set error");
        return -1;
    }
    return 0;
}

void main()
{
    int fd,wr_static,i=10;
    char *uart3 = "/dev/ttySAK0";
    char *buffer = "hello Cui!\n";
    printf("\r\nitop4412 uart3 writetest start\r\n");

    if((fd = open(uart3, O_RDWR|O_NOCTTY|O_NDELAY))<0){
        printf("open %s is failed",uart3);
    }
    else{
        printf("open %s is success\n",uart3);
        set_opt(fd, 115200, 8, 'N', 1); 
        while(i--)
        {
            wr_static = write(fd,buffer, strlen(buffer));
            if(wr_static<0)
                printf("write failed\n");
            else{
                printf("wr_static is %d\n",wr_static);
            }
            sleep(1);
        }
    }
    close(fd);
}